New field will enable eventual exports to China via 'western route' through Altai Mountains.
Presidents Vladimir Putin and Xi Jinping oversee agreement of an historic pact ahead of G20 meeting in St Petersburg.
The Japanese government is to provide financial assistance for a joint helium-production project, says newspaper The Daily Yomiuri.
Dignitaries gather on Chinese side of the pipeline to witness the formal welding of the first joint in $55billion line.
Both Greenpeace and the World Wildlife Fund are expressing grave concern at the risk of contamination in the Pechora Sea.
Russian news outlets carry blank pictures to highlight concern over detention of Denis Sinyakov.
Altai route for gas to China could take priority, reported Reuters.
Gazprom, Transneft, RusHydro, Alrosa and Rosneft all on a list for shift from Moscow to boost the Far East economy.
The fishermen were found drifting on an ice floe in the area bigger than Switzerland.